- Preparation method of monobutyltin oxide
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The invention provides a preparation method of monobutyltin oxide. The method includes the steps of firstly, adding tetrabutyl tin into a reactor, evenly stirring, slowly dropwise adding tin tetrachloride, then stirring for 30 minutes, heating to 140 DEG C, and performing heat-preservation reaction for 4-8 hours to obtain the mixed solution of monobutyltin trichloride and dibutyltin dichloride; secondly, heating the mixed solution of the monobutyltin trichloride and the dibutyltin dichloride to 95-100 DEG C, and collecting the monobutyltin trichloride; thirdly, adding the monobutyltin trichloride collected in the second step, surfactant and an organic solvent into a reactor, evenly stirring, slowly dropwise adding a sodium hydroxide solution, then heating to 90 DEG C, performing heat-preservation reaction for 3.5-4 hours, cooling to room temperature, filtering to obtain crude monobutyltin oxide, washing the crude monobutyltin oxide until the crude monobutyltin oxide is neutral, and performing reduced-pressure drying at 80 DEG C for 12 hours to obtain the monobutyltin oxide, wherein the surfactant is chitosan modified imidazoline ampholytic surfactant and quaternized polyvinyl alcohol.
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Paragraph 0072; 0773; 0087-0158; 0163
(2017/08/29)
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- Method for synthesizing loosened mono-butyl tin-oxide
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The invention discloses a method for synthesizing loosened mono-butyl tin-oxide. The method comprises the following steps: slowly adding mono-n-butyltin trichloride into a reaction kettle with alkaline liquor in a certain proportion under a constant temperature; adding prepared additives in batches in a constant-temperature reaction process; performing water washing twice after the reaction is completed; after a mono-n-butyltin trichloride product is qualified after the water washing, slowly transferring the mono-n-butyltin trichloride product into a centrifugal machine for performing centrifuging; collecting centrifuged materials, and transferring the centrifuged materials into a vacuum drying machine for drying to prepare the mono-n-butyltin trichloride product. According to the method, the additives are added into the reaction, so that the product is loosen and is easily dewatered; the water washing efficiency is greatly improved; production waste water is reduced.
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Paragraph 0013
(2017/07/04)
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